18y^2-y-1=0

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Solution for 18y^2-y-1=0 equation:


Simplifying
18y2 + -1y + -1 = 0

Reorder the terms:
-1 + -1y + 18y2 = 0

Solving
-1 + -1y + 18y2 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
18 the coefficient of the squared term: 

Divide each side by '18'.
-0.05555555556 + -0.05555555556y + y2 = 0

Move the constant term to the right:

Add '0.05555555556' to each side of the equation.
-0.05555555556 + -0.05555555556y + 0.05555555556 + y2 = 0 + 0.05555555556

Reorder the terms:
-0.05555555556 + 0.05555555556 + -0.05555555556y + y2 = 0 + 0.05555555556

Combine like terms: -0.05555555556 + 0.05555555556 = 0.00000000000
0.00000000000 + -0.05555555556y + y2 = 0 + 0.05555555556
-0.05555555556y + y2 = 0 + 0.05555555556

Combine like terms: 0 + 0.05555555556 = 0.05555555556
-0.05555555556y + y2 = 0.05555555556

The y term is -0.05555555556y.  Take half its coefficient (-0.02777777778).
Square it (0.0007716049384) and add it to both sides.

Add '0.0007716049384' to each side of the equation.
-0.05555555556y + 0.0007716049384 + y2 = 0.05555555556 + 0.0007716049384

Reorder the terms:
0.0007716049384 + -0.05555555556y + y2 = 0.05555555556 + 0.0007716049384

Combine like terms: 0.05555555556 + 0.0007716049384 = 0.0563271604984
0.0007716049384 + -0.05555555556y + y2 = 0.0563271604984

Factor a perfect square on the left side:
(y + -0.02777777778)(y + -0.02777777778) = 0.0563271604984

Calculate the square root of the right side: 0.237333437

Break this problem into two subproblems by setting 
(y + -0.02777777778) equal to 0.237333437 and -0.237333437.

Subproblem 1

y + -0.02777777778 = 0.237333437 Simplifying y + -0.02777777778 = 0.237333437 Reorder the terms: -0.02777777778 + y = 0.237333437 Solving -0.02777777778 + y = 0.237333437 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.02777777778' to each side of the equation. -0.02777777778 + 0.02777777778 + y = 0.237333437 + 0.02777777778 Combine like terms: -0.02777777778 + 0.02777777778 = 0.00000000000 0.00000000000 + y = 0.237333437 + 0.02777777778 y = 0.237333437 + 0.02777777778 Combine like terms: 0.237333437 + 0.02777777778 = 0.26511121478 y = 0.26511121478 Simplifying y = 0.26511121478

Subproblem 2

y + -0.02777777778 = -0.237333437 Simplifying y + -0.02777777778 = -0.237333437 Reorder the terms: -0.02777777778 + y = -0.237333437 Solving -0.02777777778 + y = -0.237333437 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.02777777778' to each side of the equation. -0.02777777778 + 0.02777777778 + y = -0.237333437 + 0.02777777778 Combine like terms: -0.02777777778 + 0.02777777778 = 0.00000000000 0.00000000000 + y = -0.237333437 + 0.02777777778 y = -0.237333437 + 0.02777777778 Combine like terms: -0.237333437 + 0.02777777778 = -0.20955565922 y = -0.20955565922 Simplifying y = -0.20955565922

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.26511121478, -0.20955565922}

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